/Engine/Plugins/Experimental/Animation/CurveExpression/Source/Runtime/Public/ExpressionEvaluator.h
Constants that begin with a number, include spaces or any of the above operands/parentheses are allowed, but must be then enclosed in single quotes when referenced. E.g: 'foo(1)' * 2.0 rather than: foo (1) * 2.0
class FEngine